Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python Python Collections (2016, retired 2019) Dictionaries Teacher Stats

Todd Bascombe
Todd Bascombe
Full Stack JavaScript Techdegree Student 11,133 Points

need help

where did I go wrong

# The dictionary will look something like:
# {'Andrew Chalkley': ['jQuery Basics', 'Node.js Basics'],
#  'Kenneth Love': ['Python Basics', 'Python Collections']}
# Each key will be a Teacher and the value will be a list of courses.
# Your code goes below here.

def num_teachers(teachers = None):
    numTeachers = int(len(teachers.keys()))
    return numTeachers

def num_courses(teachers = None):
    numcourse = sum(teachers.values())

    return numcourse

1 Answer

Chris Freeman
Chris Freeman
Treehouse Moderator 68,423 Points

The argument teachers is a dictionary. The length of each dict value needs to be summed together and the total returned. The direct use of sum() might work if a list comprehension was used to create a list of the value lengths, but that's beyond this stage of the course.

:point_right: create a loop to get the length of courses for each teacher and add to a total. Return the total.

Post back if you need more help. Good luck!!